De Magnis Coniunctionibus (On the Great Conjunctions)
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About this book
De Magnis Coniunctionibus by Abu Maʿshar al-Balkhī (787-886) is the classical treatise on planetary great conjunctions - the Jupiter-Saturn conjunctions that frame world-history, the triplicity shifts, and the precessional world-periods. The Latin translation by Johannes Hispalensis (John of Seville), printed by Erhard Ratdolt at Augsburg in 1489 (incunabulum, all eight tractatus + colophon), is hosted here.
Relevance to this project
The historical source of the great-conjunction / precessional-age framework: Abu Maʿshar’s Jupiter-Saturn conjunction periods are the medieval astronomical engine behind the "world-ages" idea the paper’s precession sections (Sec.5) sit alongside the Sefer Yetzirah scheme (mages: Abu Maʿshar).